Die for die cating



Oct. 7 1924.

H. RAU

DIE FOR DIE CASTING 2 Sheets-Sheet 1 Filed March 7,

:IIAIIIIIJIIIII ill ATTORNEYS Oct. 7 1924.

H. RAU

DIE FOR DIE CSTING Filed March 7. 1923 2 Sheets-Sheet 2 INVENTOR 15PM/1N PZ/ A ORNEYS- Patented Get. 7, 1924.

PATENT formes.

HERMAN BAU, OF HAMILTON BEACH, NEW YORK, ASSIGNOR 'lfO"y DOEHLER DIE; CASTING CO., A CORPORATION OIE 'NEW YORK.

DIE FOR, DIE CASTING.

Application led March 7,11923. Serialv No. 623,386.

To all whom t may concer/1L:

Be it known that I, HERMAN BAU, a citi` zen of the United States, residing at Hamilton Beach, L. I., in the county of Queens and vState of New York, have invented certain new and'useful Improvements in Dies for Die Casting, of which the following is a full, clear, and exactdescription.

`While embodiments of my invention may have la general application to the art of diecasting under pressure, they have especial utility in connection with the method of making molds for finished castings which forms the subject matter of the patent to John Kralund, Number 1,335,509, granted on March 30th, 1920, and to which my prior patent of November 16, 1920, Number 1,359,196, also relates. rIhat method contemplates the formation of soi-called match plates from which molds for the linal casting are made of plastic composition. The match plates are'composed of a plurality of units which are assembled in a complete match plate, and have base portions with smooth upper surfaces `which produce the parting surfacesl of the molds formed thereon, and integral raised portions constituting the patterns for the mold cavities. These match plate units are die-cast from a suitable alloy, and it is in the die-casting of these units that my invention has a part1cular advantage. My invention will therefore be described with reference to the Vmatch plates to be used in this method but it will ybe understood. that the invention contemplates embodiment in dies for any die-casting so far as it may be practically applied thereto, and that the invention is not limited except as hereinafter pointed out in the claims.

The match plates are formed from white metal models which are individually cast in a metal die having a proper mold cavity, and whichare then ytrimmed down and assembled on an iron plate. These unit models have va rectangular' base of proper proportions'to accommodate the particular -attern raised thereon, and vare generally a out a quarter of aninch thick. The dies or im-` v pression blocks in which these have been heretofore cast have, therefore, a rectangular cavity in the bottom of which is a deypressionv for forming the pattern and also the'necessary runs'and branches.

'By` invention I am able materially to simplify as well as reduce the cost of these dies, and also to reduce the size of the permanent impressionblock which is preserved 1 for future use. In accordance with my invention I provide what may "be termed 4an adjustable die, which makes fit possible to use removable impression blocks andl thus facilitate changing from one design of casting to another.

The die itself is preferably permanently attached to a standard ydie base or ejector e boX, and consists of a kbase plate having side. pieces on its outer face which enclose a space for an impression block and which are adjustableto accommodate impression blocks of various size. For making `match plates the adjustable die vwill usuallyhave our side pieces, one of which willvb'e stationary and'have the gate and sprue cutter openings, whilel the other three'willbe adjustable relative thereto. A'suitable cover plate will complete the die. In this way the side pieces serve as the outside boundaries for the mold cavity, while the thickness of the base of the match plajte'unit'siis determined by the difference in height between the side pieces and the impressionblock enclosed by them.

I shall now describe the illustrated embodiment of my invention and shall thereafter point out ymy invention in claims.

Fig. 1 is a plan of one embodiment lof my invention with the cover plate removed.

Fig. 2 is a sectional elevation of thevcomplete die on line 2*-2 of Figure 1.

Fig. 3 is a sectional elevation of the same lon the irregular line 3-3 of Figure 1,.

Fig. 4 is a planv of yan impression block which may be used with the die.

Fig. o is a central longitudinal sectional elevation of the same.

Fig. 6 is a plan of the `match plateunit produced by the die and illustrated impression block.

Fig. 7 is a side elevation ofthe same.

The base plate 1 is provided in ea'ch rcorner with a tap hole 2 for fastening to the` four corner legs of the die base or ejector box 3. The ejectorplate 4f carries the ejector pins 5, the number and'arrangement of which depend upon the casting. n In practice, the plate 1 could be provided ,with a number of holes in its central area which will s accommodate any number or arrangement of `ejector pins. 'Ihe plate is also yprovided llt Ill)

toward one edge With a row of elongatedopenings or slots 6 (shown three in number), and With an opening it'or the sprue cutter 7. at right angles to the line of the row ot slots 6 is a groove 7 in the outer :tace oiE the plate which is disposed toward and parallel to one side of the plate.

@n the outer tace ot the plate l are disposed tour oblong blocks 8, 9, l and ll which are arranged to enclose a rectangular space in the center of the plate l tor an impression blockw @t these blocks, the block 8 is stationary and the other three blocks are adjustable to vary` the size of the enclosed space. These blocks are all ot the same height and are covered by a cover plate l2 to complete the die.

The stationary block 8 is secured in any suitable Way to the tace of the plate l substantially in one corner thereof, and has an opening' 13 for the sprue critter 'i' in line with the sprue cutter opening through the plate l. ln the outer 'face of this block 8 is a suitable recess ld- Which serves as an inlet or gate tor the molten metal. This recess is shown as flaring in both directions trom' the sprue cutter opening 13. Two doWel pins l on this block serre to locate the top or cover plate l2, which cover plato has a gate inlet 16 Which is aligned With the sprue cutter opening when the plate l2 is in place.

rl`he block 9 has on its under tace a longitudinal tongue which lits in the 0'roove 7, and the inside longitudinal tace ot the block 9 abuts against the inner end ot the stationary block 8. To retain the block 9 in place and at the same timeallow it to be adjusted longitudinally oit the groove 7, square headed bolts 17 extend through the plate i in the groove 7 with the headed end projecting above the tace ot the plate and engaging' in a longitudinal l`slot itl in the under side ot the block 9. lt is evident that the release ot the nuts of these bolts 17' permits of the adjustment ol the block 9, and that the block is locked in any adjusted position by tightening up the nuts.

rlhe block l0, which is disposed rparallel to the stationary block 8, is mounted tor Y adjustment both transversely and longitudinally. In the construction shown, it is provided in its under tace with a longitudinal wifslot 19 in which engage the head ends ot square headed bolts 2O passing through the elongated openings or slots 6 in the base plate l.

The block ll is provided in its under tace with tivo transverse T-slots 2l in which engage tivo square headed bolts 22 which pass through the plate l and are disposed in a line parallell to the slot 7u.

',lhe adjustment of all three oi the adjustable blocks is permitted merely by letting up on the nuts on the guide bolts for the respective blocks. The inner end' ot' the block ll abuts against the inner tace of the stationary block 8 throughout its adjustinent. Any size opening toreceive the impression block in the center of the die may be obtained Within the range of the mov-able members. To vary the length ot' this space the block ll is adjusted in or out andthe block lOislongitudinally adjusted to keep its inner end in abutment Withthe f ing, it is oiilyrnecessary in` accordance Withthis invention, to make a dieblock or impression bloci ot' suitablev size having-the desired impression cutl therein, and to assemble this impression block with the adjustable bloclts), l0 andll. A sample iinpression4 block is illustrated in, Figures l# and 5, and is indicated by dotted'lines in position inxlligure 2, beingY secured against the base plate l by screws, represented'. lhe match plate unit cast from this die is illustrated in Figures 6 and 7.

By this invention.thenecessityv tor build'L ing a special ejector box for eachV casting is avoided and the amount of" special steel for producing-the impression cavity ismaterially reduced.

t is obvious that various modifications may be made in the construction, shown in the drawings and above` particularly described, within. the principle and scope oft my invention.

l claim:

l. ian adjustable die 'loi' pressure casting comprising, in combination tvith an ejector member, a bottom plate through Which the ejector member. passes, and side pieces on the outer tace of. the plate arrangedto enclose an impression bl'ocl'space andv adjustable to vary the dimensions of the enclosed space.

2. An adjustable die for pressure casting comprising, in combination with an ejector member, a bottom plate througlrvvhich the ejector member passes, andside pieces .on the outer face ofthe plate arranged to enclose an impression block space, one of' the side pieces being stationary an'd'h'avinga gate recess in its outer tace leading to the enclosed space and.k certain ofthe other side pieces being adjustable to vary the dimensions ot the enclosed space.

3. An adjustable die for pressure casting comprising, in combination With an" ejectory member', a bottom plate through which the ejector,D member passes, side pieces on the outer tace or" the plate arranged to enclose an impression block space one of the side pieces being stationary and having a gate recess in its outer face leading to. the enclosed space and certain of the other side pieces being adjustable to vary the dimensions of the enclosed space, and a cover plate on the side pieces having a gate opening communicating with the said gate recess in the stationary side piece.

4. An adjustable diefor pressure casting comprising, in combination with an ejector member, a bottom plate through which the ejector member passesjhaving an opening therethrough for a sprue cutter, a stationary block secured on the outer face of the plate and having a hole therethrough registering with the said sprue cutter opening and a gate recess on its outer face communicating with the said hole, and'three complementary blocks cooperating withthe said stationary block to enclose a space on the bottom plate for an impression block including the opening for the ejector member, one of said complementary blocks being longitudinall adjustable and another being laterally a justable to vary the dimensions of the enclosed space.

5. VAn adjustable die for pressure casting comprising, in combination with an ejector member, a bottom plate through which the ejector member passes having an opening therethrough for a sprue cutter, a stationary block secured on the outer face of the plate and having a hole therethrough registering with the said sprue cutter opening and a gate recess on its outer face communicating with the said hole, and'three complementary blocks cooperating with fthe said stationary block to enclose a rectangular space on the bottom plate for an impression block includ-v ing the opening for the ejector member, the block parallel to the stationary block being adjustable both longitudinally and vertically, and one of the other two blocks being adjustable laterally andthe other being adj ustable longitudinally', whereby the dimensions of the enclosed space may be altered.

6. An adjustable die 'for pressure casting comprising in combination with an ejector box, a plate secured to theejector box carrying a plurality of protruding headed bolts, a stationary block secured to the face of the plate, and a plurality of complementary blocks cooperating With the stationary block to enclose a space for an impression block and having T -slots therein engaging over the headed bolts and adjustable thereinto'vary the size of the enclosed space.

7. An adjustable die for pressure casting comprising, in combination with an ejector box, a plate secured to the ejector box having a groove across its outer face anda plurality of slots arranged in a line transverse to the groove, a plurality of protruding headed bolts in the groove, a headed bolt in each slot, and a row of protruding headed bolts parallel to the groove, a block having a longitudinal tongue engaging in the groove and a longitudinal T-slot engaging over the bolts in the groove, a second block having a longitudinal T-slot engaging over the bolts in the slots, a third block having transverse T-slots engaging over the said row of bolts, and a stationary block secured to the face of the plate and cooperating with the other three blocks to enclose a rectangular space for an impression block.

8. An adjustable die for pressurelcasting comprising, in combination with an ejector box, a plate secured to the ejector box having al groove across its outer face and a p-lurality of slots arranged in a line transverse to the groove, a plurality of protruding headed bolts in the groove, a headed bolt in each slot, and a row of protruding headed bolts parallel to the groove, a block having a longitudinal tongue engaging in the groove and a longitudinal T-slot engaging over the bolts in the groove, a second block having a longitudinal T-slot engaging over the bolts in the slots, a third block having transverse T-slots engaging over the said row of bolts, a stationary block secured to the face of the plate and cooperating with the other three blocks to enclose a'rectan'gular space for an impression block, the stationary block having a gate recess leading to the enclosed space, and a cover plate on the blocks having a gate opening communicating withY the gate j recess in the stationary block. v

In witness whereof, I hereunto subscribe my signature. f

HERMAN RAU. 

